I interviewed at some of these programs last year, didn't match at one of these but I would personally say
BIDMC- Harvard name/resources opens doors, great fellowship match, residents seemed happy, great, involved chair, negative is it is great in its own right but because of affiliation always compared/overshadowed by sister program
UCLA- Elite program in warm city, cant ask for much more.
Northwestern/Vanderbilt- All around solid programs, just not as exciting as above two
Yale- Not as strong as academic reputation
UVA- Didn't interview here
All 6 strong programs, but I think the top two stand out most.
Enjoy fourth year, currently on nights watch on wards.